基于双PWM协调控制的双馈风力发电机组非线性因素分析

Based on a variable speed constant frequency doubly fed wind turbine generator model, which is controlled by double PWM converter; A comparative analysis of a doubly fed induction generator's mathematical model, which is based on three-phase static coordinate system and two-phase synchronization reference frame, point out the nonlinear factors which exist in the variable speed constant frequency wind generator, and it also finds that the nonlinear factors can be obviously decreased by coordinate transformation; Further more, by an analysis of a mainstream control scheme of AC-excited power supply for the wind turbine generator , points out the advantages and disadvantages which is generated by using vector control system's linear control theory to slove the nonlinear system, such as doubly fed induction generator; finally, some nonlinear decoupling control strategies are discussed, which point out the prospect for further optimization of variable speed constant frequency doubly fed wind power generator system's function.